TITLE: A METHOD FOR MANUFACTURING SCREW ROTORS.
European Patent Application EP0411000 A1

ABSTRACT:
Abstract not available for EP0411000
Abstract of corresponding document: WO8909881
The invention relates to a method of manufacturing rotors of the kind
having helical lands and intermediate grooves. A rotor body (2) is
moulded or formed in some other way on a shaft (1) to only a small
degree of accuracy, whereafter an outer layer (3) of polymer-based
material is moulded on the rotor body to a high degree of accuracy. For
the purpose of eliminating shrinkage-induced distortion of the lands of
the rotor body (2) subsequent to applying the outer layer, the rotor
body is produced in a multiple of layers (21, 22), by casting or like
moulding processes, with each of said body layers having a thickness
which is greater than that of the outer layer (3).

INVENTORS:
Timuska, Karlis (SE)

APPLICATION NUMBER: EP19890904637
PUBLICATION DATE: 02/06/1991
FILING DATE: 04/04/1989

ASSIGNEE: SVENSKA ROTOR MASKINER AB (SE)
INTERNATIONAL CLASSES: F04C18/16; B29C37/00; B29C39/02; B29C70/06; B29D99/00; F01C1/08;
F04C2/16; B29K105/06; B29L31/08; (IPC1-7): F04C18/16
EUROPEAN CLASSES: B29D99/00D; B29C37/00D; B29C39/02B3; B29D99/00S; F01C1/08B2

OTHER REFERENCES:
See references of WO 8909881A1